The current common solution mainly includes the following:
1. Material aspects
Considering the compatibility of glass fiber and matrix, surface treatment of glass fiber, such as adding some coupling agents and grafts;
Lubricant is added. Lubricant is mainly due to the dispersion of glass fiber and some lubricants have external lubrication. They easily run to the surface of the product to form a smooth layer.
There are also some other fillers that have improved results, and they will not be listed here.
2. Injection processing
Increase material temperature and mold temperature;
High pressure and high speed;
Rapid hot and cold forming technology (RHCM).
Because if the molten plastic cures too quickly when it contacts the mold wall, the glass fiber cannot be completely covered, that is, surface floating phenomenon occurs. For RHCM molding, due to the high mold temperature, the glass fiber at the cavity interface can be completely covered by the plastic melt, and since the site is in a molten state, the orientation of the glass fiber tends to be uniform and the shrinkage uniformity is ensured, thereby ensuring Molding quality.
3. Mold aspects
Deliberately make the appearance of the product into a matte or etched surface to reduce the visual response of the exposed fiber.
At present, the most widely used fiber material in the market is nylon plus fiber material. Due to the exposure of glass fiber, the application of such products has been limited, and it is mainly applied to some high-strength structural parts. Anything that uses fiber-reinforced materials as the appearance part is basically a matt surface or an etched surface (such as a power tool), because the ordinary fiber-added material is difficult to achieve a beautiful appearance.